Dry Firing

The Impact will fire without a pellet in the chamber. Don't do it. Most of the time, no issue, but once in a while, you can blow an O-Ring, and possibly damage the valve seat.

I did fire mine without a pellet, or barrel for that matter. I had the barrel off and didn't realize It was cocked (stupid time) and bumped the trigger while I was changing the barrel to a new STX. BANG! and immediately destroyed the O-Rings around the regulator, and destroyed the valve seat. 

If you have any questions, call FX USA in North Carolina and ask them directly. They'll give you absolute correct answer as to whether it damages the gun or not. 866-639-0772. You can either have the person answering the phone ask the tech while you wait for the answer (they did that for me), or set an appointment to have the tech call you back (and you might even get Ernest Rowe). They did that for me on another call.

It's a phenomenal gun, you are incredibly lucky to have one.
 
The FX warning is against firing when "empty of air", which is true of any PCP rifle. As long as the bottle is charged, I have never heard that it is harmful to dry fire it.

That is my understanding also. As long as you ensure that it is safe - i.e point rifle in the right direction and always assume it is loaded, i don't see any issue. On the other hand, it is a no-no to dry fire when empty of air, or even at extremely low bottle pressure as you could damage the valve.
 
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You ideally should be able to dry fire provided good air pressure, low or empty pressure = bad idea. Most regulated actions after sitting for a long period with higher pressure on the HPA side than regulated side will see some 'pressure creep' that generally has to be resolved by dry firing once or twice prior to use or your first shot or two will be a much lower velocity than the following shots.
 
My Crown does that tsmith.

I don't know what it is, but I have no leaks that I can tell, and I get a tight ES and very good accuracy.

One of my videos you can hear it.

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Regulator creep = Result of pressure differential combating itself over time (reg @ 2k, hpa @ 3k = 3k wins 'the war' over time bleeding little bits of pressure till seal is TIGHT TIGHT )


Regulator Squeal = Result of regulator refilling AND/OR 'atmospheric venting'. My regulator personally only does it when @ or near regulated pressure, its a good alarm to refill.
 
tor47: As I'll soon have my first PCP, I am just starting to learn HPA mechanics.

If the reg pressure increases after a period of time... why would you need to fire a shot or two to avoid the first shot being fired with less speed. I would think if the reg pressure did rise a little, the first shot would be faster unless it was so high your hammer couldn't open the valve.